Systems and Methods for Control of Integrated Circuits Comprising Body Biasing Systems

1. A computer system comprising: first circuitry configured to implement a plurality of power modes of said computer system, wherein said plurality of power modes comprises a mode in which said computer system does not execute instructions; and said first circuitry further configured to decrease static power consumption of said mode by application of a plurality of body biasing voltages to second circuitry of said computer system.

2. The system of claim 1 wherein said second circuitry of said computer system comprises a microprocessor.

3. The system of claim 1 wherein said first circuitry comprises a charge pump.

4. The system of claim 1 wherein said first circuitry comprises a multiplexer.

5. The system of claim 4 wherein said multiplexer is configured for control by a power state signal generated by a southbridge.

6. The system of claim 1 further comprising a plurality of default information to initialize said plurality of power modes.

7. The system of claim 1 wherein said plurality of body biasing voltages is configured to be modified by a processor of said computer system.

8. The system of claim 1 wherein said first circuitry is configured to operate when said computer system is unable to execute software instructions.

9. An apparatus comprising: means for determining a particular power condition, of a set of power conditions, of a computer system comprising a microprocessor, wherein said set of power conditions comprises a power down state; means for accessing body biasing voltage information corresponding to said particular power condition; and means for commanding a voltage supply coupled to a body terminal of said microprocessor to generate a voltage corresponding to said body biasing voltage information corresponding to said particular power condition.

10. The apparatus of claim 9 wherein said means for determining comprises means for accessing a plurality of signal lines from a southbridge.

11. The apparatus of claim 10 wherein said means for accessing comprises means for allowing at least one of said plurality of signal lines to control a multiplexer.

12. The apparatus of claim 9 wherein said body biasing voltage information is modifiable by said computer system.

13. The apparatus of claim 9 wherein: said means for determining, said means for accessing, and said means for commanding are all operable when said microprocessor is unable to execute software instructions.

14. The apparatus of claim 9 wherein said means for commanding comprises means for selectively coupling said body biasing voltage information to said voltage supply.

15. An integrated circuit comprising: a plurality of registers configured to store body biasing voltage information corresponding to a plurality of power modes of a computer system; and first circuitry configured to selectively couple body biasing voltages corresponding to said body biasing voltage information to second circuitry of said integrated circuit according to a selected power mode of said plurality of power modes, wherein said selected power mode is established open loop.

16. The integrated circuit of claim 15 wherein said first circuitry comprises a charge pump.

17. The integrated circuit of claim 15 wherein said plurality of power modes comprises a DSX power state.

18. The integrated circuit of claim 15 further comprising a multiplexer configured to be controlled by a power state signal generated by a southbridge.

19. The integrated circuit of claim 15 wherein said plurality of registers is configured to be modified by said microprocessor.

20. The integrated circuit of claim 15 wherein said circuitry to selectively couple is operable when said microprocessor is unable to execute software instructions.